<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <!-- 使用while循环执行replace操作 -->
    <script>
        var data = {
            name: '张三',
            age: 20,
        };
        var str = '<div>{{name}}今年{{age}}岁了</div>';
        var pattern = /{{\s*([a-zA-z]+)\s*}}/;

        var patternResult = null;
        while (patternResult = pattern.exec(str)) {
            str = str.replace(patternResult[0], data[patternResult[1]]);
        };
        console.log(str);
    </script>
</body>

</html>